package com.qingcheng.service.impl;

import com.alibaba.dubbo.config.annotation.Reference;
import com.alibaba.dubbo.config.annotation.Service;
import com.qingcheng.pojo.goods.Category;
import com.qingcheng.pojo.goods.Sku;
import com.qingcheng.pojo.order.OrderItem;
import com.qingcheng.service.goods.CategoryService;
import com.qingcheng.service.goods.SkuService;
import com.qingcheng.service.order.CartService;
import com.qingcheng.service.order.PreferentialService;
import com.qingcheng.util.CacheKey;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;

import java.util.*;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;


@Service
public class CartServiceImpl implements CartService {

    @Autowired
    private RedisTemplate redisTemplate;

    @Reference
    private CategoryService categoryService;

    @Reference
    private SkuService skuService;

    @Autowired
    private PreferentialService preferentialService;

    @Override
    public List<Map<String, Object>> findCartList(String username) {
//        System.out.println("从redis中提取购物车" + username);
        List<Map<String, Object>> cartList =
                (List<Map<String, Object>>) redisTemplate.boundHashOps(CacheKey.CART_List).get(username);
        if (cartList == null) {
            cartList = new ArrayList<>();
        }
        return cartList;
    }

    public void addItem(String username, String skuId, Integer num) {
        //实现思路： 遍历购物车，如果购物车中存在该商品则累加数量，如果不存在则 添加购物车项
        // 获取购物车
        //1: 查询购物车    雪碧  4  -2    -2
        List<Map<String, Object>> cartList = this.findCartList(username);
        boolean flag = false;

        //2:list 循环  skuId== id   购物车的修改 num+   item、check
        if (cartList.size() > 0) {
            for (Map map : cartList) {
                OrderItem orderItem = (OrderItem) map.get("item");
                if (orderItem.getSkuId().equals(skuId)) {
                    //清除删除的购物车
                    if (orderItem.getNum() <= 0) {
                        //如果数量小于等于0  购物车项删除
                        cartList.remove(map);
                        flag = true;
                        break;
                    }
                    orderItem.setNum(orderItem.getNum() + num);  //修改数量
                    orderItem.setMoney(orderItem.getPrice() * orderItem.getNum());  //修改价钱   单价*总数量
                    if (orderItem.getNum() == 0) {
                        orderItem.setWeight(0);
                    } else {
                        int weight = orderItem.getWeight() / orderItem.getNum(); //单个商品的重量
                        orderItem.setWeight(weight * num);
                    }


                    //清除删除的购物车
                    if (orderItem.getNum() <= 0) {
                        //如果数量小于等于0  购物车项删除
                        cartList.remove(map);
                    }
                    //购物车判断是否重复提交
                    flag = true;
                    break;

                }
            }
        }
        //3：skuId！= id   orderItem  set     redis hash  数据校验  sku是否存在

        //从数据库把商品查询出来
        if (flag == false) {
            Sku sku = skuService.findById(skuId);
            if (sku == null) {
                throw new RuntimeException("商品不存在");
            }
            if (!"1".equals(sku.getStatus())) {
                throw new RuntimeException("商品状态不合法");
            }
            if (num <= 0) {
                //数量不能为0或负数
                throw new RuntimeException("商品数量不合法");
            }


            OrderItem orderItem1 = new OrderItem();
            orderItem1.setSkuId(skuId);
            orderItem1.setSpuId(sku.getSpuId());
            orderItem1.setNum(num);
            orderItem1.setImage(sku.getImage());
            orderItem1.setPrice(sku.getPrice());
            orderItem1.setName(sku.getName());
            orderItem1.setMoney(orderItem1.getPrice() * num);//金额计算
            if (sku.getWeight() == null) {
                sku.setWeight(0);
            }
            orderItem1.setWeight(sku.getWeight() * num); //重量计算

            //获取二级分类
            orderItem1.setCategoryId3(sku.getCategoryId());

            Category category3 = (Category) redisTemplate.boundHashOps(CacheKey.CART_List).get(sku.getCategoryId());
            if (category3 == null) {
                category3 = categoryService.findById(sku.getCategoryId());
                //根据3级分类id查2级
                redisTemplate.boundHashOps(CacheKey.CART_List).put(sku.getCategoryId(), category3);
            }
            orderItem1.setCategoryId2(category3.getParentId());

            //获取一级分类
            Category category2 = (Category) redisTemplate.boundHashOps(CacheKey.CART_List).get(category3.getParentId());
            if (category2 == null) {
                category2 = categoryService.findById(category3.getParentId());
                //根据2级分类id查询1级
                redisTemplate.boundHashOps(CacheKey.CART_List).put(category3.getParentId(), category2);
            }
            orderItem1.setCategoryId1(category2.getParentId());

            //构建购物车数据结构
            Map cartMap = new HashMap();
            cartMap.put("item", orderItem1);
            cartMap.put("checked", true);
            //默认选中
            cartList.add(cartMap);
        }
        //添加购物车信息到redis   购物车只操作 redis  不会放到数据库中
        redisTemplate.boundHashOps(CacheKey.CART_List).put(username, cartList);
        redisTemplate.boundHashOps(CacheKey.CART_List).expire(30, TimeUnit.DAYS);
    }

    @Override
    public boolean updateChecked(String username, String skuId, boolean checked) {
        //获取购物车
        List<Map<String, Object>> cartList = this.findCartList(username);
        //判断缓存中是含有已购物商品
        boolean isOk = false;
        for (Map map : cartList) {
            OrderItem orderItem = (OrderItem) map.get("item");
            if (orderItem.getSkuId().equals(skuId)) {
                map.put("checked", checked);
                isOk = true;
                //执行成功
                break;
            }
        }
        if (isOk) {
            redisTemplate.boundHashOps(CacheKey.CART_List).put(username, cartList);
            // 存入缓存
            redisTemplate.boundHashOps(CacheKey.CART_List).expire(30,TimeUnit.MINUTES);
        }
        return isOk;
    }

    @Override
    public void deleteCheckedCart(String username) {
        //获取未选中的购物车
        List<Map<String, Object>> cartList = findCartList(username).stream().filter(
                cart -> (boolean) cart.get("checked") == false).collect(Collectors.toList());
        redisTemplate.boundHashOps(CacheKey.CART_List).put(username, cartList);// 存入缓存
    }

    @Override
    public int preferential(String username) {
        //获取选中的购物车 List<OrderItem> List<Map>
        List<OrderItem> orderItemList = findCartList(username).stream().
                filter(cart -> (boolean) cart.get("checked") == true).
                map(cart -> (OrderItem) cart.get("item")).collect(Collectors.toList());
        //按分类聚合统计每个分类的金额 group by
        Map<Integer, IntSummaryStatistics> cartMap = orderItemList.stream().
                collect(Collectors.groupingBy(OrderItem::getCategoryId3,
                        Collectors.summarizingInt(OrderItem::getMoney)));
        //循环结果，统计每个分类的优惠金额，并累加
        int allPreMoney = 0;
        //累计优惠金额
        for (Integer categoryId : cartMap.keySet()) {
            // 获取品类的消费金额
            int money = (int) cartMap.get(categoryId).getSum();
            int preMoney = preferentialService.findPreMoneyByCategoryId(categoryId, money);
            //获取优 惠金额
            System.out.println("分类：" + categoryId + " 消费金额：" + money + " 优 惠金额：" + preMoney);
            allPreMoney += preMoney;
        }
        return allPreMoney;
    }

    @Override
    public List<Map<String, Object>> findNewOrderItemList(String username) {
        //获取选中的购物车
        List<Map<String, Object>> cartList=this.findCartList(username);
        //循环购物车列表，重新读取每个商品的最新价格
        for(Map<String,Object> cart:cartList){
            OrderItem orderItem=(OrderItem)cart.get("item");
            Sku sku = skuService.findById(orderItem.getSkuId());
            orderItem.setPrice(sku.getPrice());//更新价格
            orderItem.setMoney(sku.getPrice()*orderItem.getNum());//更新金额
        }
        redisTemplate.boundHashOps(CacheKey.CART_List).put(username,cartList);
        redisTemplate.boundHashOps(CacheKey.CART_List).expire(30, TimeUnit.DAYS);
        //存入缓存
        return cartList;
    }


}

